How can I configure costing for a benefits rate at all tiers?

Use the Costing Method list on the Create Standard Rates page, Additional Information section, Processing Information tab. Select Primary assignment 100% if you want to cost 100 percent of the rate of a benefit plan to the participant's primary assignment in payroll.

You might not want to use the costing option if you haven't set up cost accounts for employees or you only use payroll to generate element entries, but not process them further. If you don't want to use this costing option, the cost at the employment level is still set at the payroll relationship level.